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PTHREAD_ATTR_GETSTACKADDR(PPOSIX Programmer's ManuPTHREAD_ATTR_GETSTACKADDR(P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       pthread_attr_getstackaddr, pthread_attr_setstackaddr - get and set  the
       stackaddr attribute

SYNOPSIS
       #include <pthread.h>



       int pthread_attr_getstackaddr(const pthread_attr_t *restrict attr,
	      void **restrict stackaddr);
       int pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr);


DESCRIPTION
       The  pthread_attr_getstackaddr()	 and pthread_attr_setstackaddr() func-
       tions, respectively, shall get and set the  thread  creation  stackaddr
       attribute in the attr object.

       The  stackaddr  attribute  specifies the location of storage to be used
       for the created thread's stack. The size of the	storage	 shall	be  at
       least {PTHREAD_STACK_MIN}.

RETURN VALUE
       Upon    successful    completion,    pthread_attr_getstackaddr()	   and
       pthread_attr_setstackaddr() shall return a value of  0;	otherwise,  an
       error number shall be returned to indicate the error.

       The pthread_attr_getstackaddr() function stores the stackaddr attribute
       value in stackaddr if successful.

ERRORS
       No errors are defined.

       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The specification of the stackaddr attribute presents several  ambigui-
       ties  that  make	 portable  use	of  these  interfaces  impossible. The
       description of the single address parameter as a "stack" does not spec-
       ify  a  particular  relationship	 between  the  address and the "stack"
       implied by that address. For example, the address may be taken  as  the
       low  memory  address of a buffer intended for use as a stack, or it may
       be taken as the address to be used as the initial stack pointer	regis-
       ter  value  for the new thread. These two are not the same except for a
       machine on which the stack grows "up" from low memory to high,  and  on
       which  a	 "push"	 operation  first  stores the value in memory and then
       increments the stack pointer register. Further, on a machine where  the
       stack  grows  "down"  from  high	 memory	 to low, interpretation of the
       address as the "low memory" address requires  a	determination  of  the
       intended size of the stack. IEEE Std 1003.1-2001 has introduced the new
       interfaces  pthread_attr_setstack()  and	  pthread_attr_getstack()   to
       resolve these ambiguities.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       pthread_attr_destroy()	   ,	  pthread_attr_getdetachstate()	     ,
       pthread_attr_getstack()	    ,	   pthread_attr_getstacksize()	     ,
       pthread_attr_setstack()	, pthread_create() , the Base Definitions vol-
       ume of IEEE Std 1003.1-2001, <limits.h>, <pthread.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group		     2003	  PTHREAD_ATTR_GETSTACKADDR(P)
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